Research On The Process Of EDM Texturing Of Non-magnetic Steel To Improve The Light Absorption Rate

It’s favorable to improve the light absorption rate by the structure of randomconcave and convex texturing surface by electrical discharge machining (EDM). Theinfluence of light absorption rate by the different parameters of EDM texturingprocess was studied by the EDM texturing experiment in the surface of non-magneticsteel.Four groups of orthogonal experiments were designed to analysis the influenceof electrical parameters on texturing morphology, such as a small current and pulsewidth, a small current and high pulse width, a high current and a small pulse width, ahigh current and pulse width. The texturing morphology was observed by thescanning electron microscopy (SEM). The height Root-Mean-Square (RMS) and thecorrelation length were measured and calculated at high magnification by theinstrument used to measure the texturing morphology. The regularity of variation wasalso analyzed. The light absorption rate on the visible light band of textured surfaceunder different surface topography was simulated with the FDTD Solutions software.Finally, the light absorption rate was measured with the method of lumped parametercalorimetry by build their own experimental platform to measure temperature. Theexperimental results were also analyzed to summarize the interaction between theroughen morphology parameters and the absorbance.It’s shown that the average diameter of pits in the textured surface is increasedgradually, and the surface roughness first increased and then decreased with theincrease of peak current. The roughness in the textured surface increased with theincrease of pulse width under a smaller pulse width. The roughness in the texturedsurface increased with the decrease of pulse width and the height Root-Mean-Squaredecreased gradually with the increase of processing time under a larger pulse width.The height Root-Mean-Square increased gradually with the increase of peak currentunder a small peak current and pulse width. The height Root-Mean-Square increased gradually with the increase of pulse width under a high peak current and a small pulsewidth. The influence of electrical parameters on correlation length is various. Therules are different under different processing conditions. The light absorption ratedecreased gradually with the increase of correlation length, increased gradua lly withthe increase of ratio between the height Root-Mean-Square and correlation length,also decreased gradually under a high peak current and pulse width by themeasurement of light absorption rate.